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问题 选择题

We'll _________ learn English well soon.[ ]

A. can

B. could

C. be able

D. be able to

答案

答案：D

选择题

All of the flowers now raised here have developed from those _______ in the forest.

A．once they grew

B．they grew once

C．they once grew

D．once grew
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探究题

黄土高原上的黄土究竟是哪来的？“风成说”提出如下证据，请你发挥你的聪明才智并结合下列证据推测黄土高原上的黄土的形成过程。

①不管地表起伏状况，黄土覆盖的厚度是差不多的。

②黄土高原自西北向东南，黄土的颗粒越来越细。

③黄土的矿物成分与所堆积的基岩的矿物种类极不相同，却与中亚、蒙古等地的戈壁、沙漠矿物成分相同。

④黄土中有随地形起伏的多层古土壤。

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